Re: [Xen-users] ramdisk option in domU config file does not work

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Li Ge wrote:

> This problem seems to have something to do with the size of the 
> ramdisk file. But I am not quite sure.
> I tried it on different distros(SLES9, RHEL4, FC3). Here is what I 
> observed:
> 1. Can not create domU with ramdisk option using the domU initrd file 
> (1.2 MB) of SLES9 or the domU initrd file (1.4 MB) of RHEL.
> 2. I can create domU on one RHEL box with ramdisk option using the 
> initrd-2.6.12-xenU file copied from another Fedora Core box, which has 
> relatively smaller file size (300KB). But using the original ramdisk 
> file of RHEL, I failed to create domU.
> Is there a limitation for ramdisk file size, for example <1M?
The typically limitation is 4MB which is what our default ramdisk size is.

Please note, that you cannot use out-of-the-box ramdisk that come from 
distros as they contain kernel modules that have not been compiled for 
Xen.  You must make a ramdisk with the appropriate utilities.
Dave might be running into the same problem.

Regards,

Anthony Liguori

> Thanks,
> Li
>
> Inactive hide details for 
> dfbp@xxxxxxxxxxxxxxxxxxxxxxxxxxx@us.ltcfwd.linux.ibm.com
>
>                         *dfbp@xxxxxxxxxxxxxxxxxxxxxxx*
>                         Sent by: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
>
>                         07/26/2005 02:26 PM
>
>         
>
> To
>         
> boris.lenzinger@xxxxxxxxx
>
> cc
>         
> Li Ge/Austin/IBM@IBMUS, xen-users@xxxxxxxxxxxxxxxxxxx
>
> Subject
>         
> Re: [Xen-users] ramdisk option in domU config file does not work
>
>         
>
>
> I have 1GB of memory on my machine, of which 756 are free. Whenever I
> try to start a DomU with an initrd file, I get the same error that Li Ge
> reported:
> Using config file "vm1.cfg".
> Error: Error creating domain: (0, 'Error')
>
> DomU will start just fine without the initrd; however, in one case where
> I have a DomU with a Reiser FS, I need to be able to use the initrd (I
> know I can build support for Reiser into the kernel, but that is not the
> point).
>
> On Tue, 2005-07-26 at 11:18 +0200, Boris Lenzinger wrote:
> > Hi,
> >
> > I had this problem (well I think it was the same): you do not have
> > enough free memory to run your instance.
> >
> > run:
> > xm info
> >
> > It will tell you how much free memory you have.
> > First solution is to decrease the memory in the configuration to check
> > if you can run your configuration.
> > If it is working (and you need more memory), decrease memory of dom0.
> >
> > If still not working, what is the log file saying ? (/var/log/xend.log
> > on a fedora distribution)
> >
> > Boris
> >
> > Li Ge wrote:
> >
> > > Hi,
> > > I added ramdisk option in domU config file to let it load initrd when
> > > domU is booting up. I got the follow error message:
> > >
> > > # xm create /root/vm1.cfg -c
> > > Using config file "/root/vm1.cfg".
> > > Error: Error creating domain: (0, 'Error')
> > >
> > > When I commented the ramdisk option out, the problem went away and I
> > > could start domU without a problem. Here is the domU config file I 
> used:
> > >
> > > # Kernel image file.
> > > kernel = "/boot/vmlinuz-2.6-xenU"
> > >
> > > # Optional ramdisk.
> > > #ramdisk = "/boot/initrd-2.6.12-xenU-reiserFS"
> > > ramdisk = "/boot/initrd-2.6.12-xenU"
> > >
> > > # Initial memory allocation (in megabytes) for the new domain.
> > > memory = 128
> > >
> > > # A name for your domain. All domains must have different names.
> > > name = "vm1"
> > >
> > > disk = [ 'phy:sda7,hda1,w' ]
> > >
> > > # Set if you want dhcp to allocate the IP address.
> > > #dhcp="dhcp"
> > > # Set netmask.
> > > #netmask=
> > > # Set default gateway.
> > > #gateway=
> > > # Set the hostname.
> > > #hostname= "vm%d" % vmid
> > >
> > > # Set root device.
> > > root = "/dev/hda1 ro"
> > >
> > > # Sets runlevel 4.
> > > extra = "4"
> > >
> > > Could it be something I've missed? The xen version is the 
> xen-unstable
> > > tree with latest changeset 5814.
> > >
> > > Thanks,
> > > Li
> > >
> > 
> >------------------------------------------------------------------------
> > >
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> > >http://lists.xensource.com/xen-users
> > >
> >
> >
> > _______________________________________________
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> > http://lists.xensource.com/xen-users
> >
> --
> Regards,
>
> David F Barrera
> Linux Technology Center
> Systems and Technology Group, IBM
>
> "The wisest men follow their own direction. "
>                                                        Euripides
>
>
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